Achievements

In GRIS, there are 17 achievements, separated into several types of achievements: achievements that are involved in the story of the game (each of which can be achieved only by completing a part of a game), achievements that can be unlocked from either locating hidden objects in the game or by completing mechanics in the game perfectly, achievements that are linked to each stage in the game, and two other achievements that don't belong in these categories.

Story achievements
There are five story achievements:
 * Red
 * Green
 * Blue
 * Yellow
 * The End

Level achievements
There are five level achievements in the game:
 * Sandstorm
 * Inuksuit
 * Apples
 * Eel
 * Magic Fowls

Five stages of grief
There are five "five stages of grief" achievements in the game:
 * Denial
 * Anger
 * Bargaining
 * Depression
 * Acceptance

Others
There are two other achievements that do not belong in the above categories:
 * Mementos: for this achievement, players have to collect as many mementos from each of the game's chapters as they could.
 * Childhood: this achievement is handed to the player as they will be able to access the new area once they collect all of the Mementos.